My GUI Won't Work In The Main Player But Works In Studio. What should I do?

Also the GUI is activated by touching a block I need someone to help make it work in game. The gui dosent have any code. So the reason it wont work is likely in the script. Heres the script. If I need to add any script the gui itself please give the code. But heres the script now. The gui Is called "Message"

local debounce = true

function onTouched(part) if part.Parent == nil then return end local h = part.Parent:findFirstChild("Humanoid") if (h~=nil) then if h.Health == 0 then return end local thisplr = game.Players:findFirstChild(h.Parent.Name) if (thisplr~=nil) then local cash = thisplr:findFirstChild(script.Parent.Parent.Name)

				if (debounce == true) and (cash.Value == 1) then
				if thisplr == nil then return end
				debounce = false
				if thisplr == nil then return end
				local h = thisplr.PlayerGui.Message.msg1
				h.Visible = true
				h.Text = "You Already Got This Star."
				wait(4)
				if thisplr == nil then return end
				h.Visible = false
				debounce = true
				if (script.Parent.Parent.Return.Value == true) then
					if thisplr.Character == nil then return end
					wait(0.1)
					thisplr.Character.Torso.Anchored = true
					thisplr.Character.Head.Anchored = true
					wait(0.5)
					thisplr.Character.Torso.Anchored = false
					thisplr.Character.Head.Anchored = false
				end
			elseif (cash.Value == 0) and (debounce == true) then
				if thisplr == nil then return end
				debounce = false

				thisplr.Checkpoint.Value = Vector3.new(-1,-1,-1)
				local h = thisplr.PlayerGui.Message.msg1
				h.Visible = true
				h.Text = script.Parent.Parent.StarDes.Value
				wait(0.1)
				cash.Value = 1
				thisplr.leaderstats.Stars.Value = thisplr.leaderstats.Stars.Value + 1
				thisplr.totalstars.Value = thisplr.totalstars.Value + 1
				wait(4)
				if thisplr == nil then return end
				h.Visible = false

				if (script.Parent.Parent.Return.Value == true) then
					if thisplr.Character == nil then return end
					if thisplr == nil then return end
					if thisplr.Character == nil then return end
					wait(0.1)						
					thisplr.Character.Torso.Anchored = true
					thisplr.Character.Head.Anchored = true
					wait(0.5)
					thisplr.Character.Torso.Anchored = false
					thisplr.Character.Head.Anchored = false
				end
			debounce = true
				end					
			end
	end
end

script.Parent.Touched:connect(onTouched)

Please make the entire thing in a code block.